【作者】 唐萍；

【导师】 谷立臣；

【作者基本信息】 长安大学 ， 机械电子工程， 2010， 硕士

【摘要】 针对液压设备状态检测、故障诊断的特点和发展趋势,本文以信息融合理论为指导思想,利用虚拟仪器开发平台对液压动力系统多源诊断信息的获取以及分析方法进行了研究,其主要工作如下：1、在课题组前期对液压动力系统信号获取及故障机理分析基础上,对基于虚拟仪器的液压设备多源诊断信息获取实验系统研究的理论基础进行了分析,研究了实验系统的构建方法和硬件平台的搭建原理,在对多种软件开发平台特性进行对比的基础上,选用LabVIEW作为实现对基于虚拟仪器的液压设备多源诊断信息获取实验系统统的软件平台。2、进行了故障诊断专家系统分析,BP神经网络基础学习,信号分析相关研究,以及分析传感器技术基础,总结了传感器选型的原则,论述四种信号传输与总线性能,并选择PXI作为对基于虚拟仪器的液压设备多源诊断信息获取实验系统的总线；为实验系统软硬件开发奠定了理论基础。3、为了能够更好研发对基于虚拟仪器的液压设备多源诊断信息获取实验系统,分析了液压动力系统诊断信息获取实验平台的机械系统、液压系统及电气系统构成要素；对实验主要内容、实验步骤进行了详细规划；收集液压动力系统及其各元件故障类型、故障形成原因和解决方法,为建立液压动力故障诊断专家系统的知识库提供诊断知识,为后续硬件平台搭建和虚拟面板开发做好铺垫。4、根据液压动力系统故障诊断专家系统虚拟面板开发的需要,对诊断信息获取实验平台硬件构成、传感器选择、标定以及虚拟仪器硬件平台搭建进行了研究；并以此为基础搭建虚拟仪器硬件平台,用LabVIEW软件平台完成本文系统虚拟面板开发。软件开发主要有系统简介模块、在线监测模块、数据分析模块、故障诊断模块和数据库管理模块。探讨了BP神经网络用于液压设备故障诊断专家系统的可行性。更多还原

【Abstract】 In connection with the characterizes and the development trend of on-line monitoring and fault diagnosis of hydraulic system, this paper studied multi-source diagnostic information acquisition and fault diagnosis of hydraulic power system with the direction of expert System based on virtual instrument. The researched results are as follows:1.Basing on the gained results of our research group about the acquisition of electro-hydraulic signals and fault mechanism of hydraulic power system previously, theory of experiment system based on virtual instrument is analyzed. The experiment system and hardware platform’s design principle are also discussed. In contrast to characteristizes of a variety of software, Lab VIEW is the best choice as the software platform for multi-source diagnosis information acquisition experiment system of hydraulic equipment.2.In this paper, fault diagnosis expert system is analyzed, BP ANN is basely learned, signal analysis and sensor technology are researched, the selection principle of the sensor and four types of signal transmission and bus function are also studied, at last PXI is chosen as the bus of multi-source diagnosis information acquisition experiment system of hydraulic equipment based on virtual instrument. All of these have laid a theoretical foundation for the construction of hardware and the exploitation of virtual panels.3.In order to deeply research the multi-source diagnosis information acquisition experiment system of hydraulic equipment, the elements of its mechanical system, hydraulic system and electrical system are analyzed in deep. A detailed plan for the experiment main contents and the experiment steps are carried out. The fault types, fault causes and solutions of hydraulic power system are collected, which affords basis for the establishment of knowledge base of hydraulic power system fault diagnosis, and laying a good foundation for its hardware and software.4. According to the development need of virtual panel of the fault diagnosis expert system of hydraulic power system, the hardware structure of the experiment platform to get the diagnostic information, the selection and calibration of sensors and how to construct the hardware platform for virtual instrument are studied. Afterward, virtual instrument hardware platform is constructed; Exploitation of virtual panels is completed with the help of Lab VIEW software platform. Software development includes system introduction module, on-line monitoring module, data analysis module, fault diagnosis module and a database management module. At last the feasibility of using BP ANN in the fault diagnosis expert system of hydraulic power system is discussed.更多还原